I don't want to give out my idea since I think it's pretty big, but I'll use this as an example. I'm skilled at something and I want to teach a select number of students that skill. Let's say I want to cap it at 50 students at a time...and those students would be un-enrolled once the course is over. Then I'd send out 50 new invitations for a new round. Does that make sense?
Also, this site would not rank and it would be extremely exclusive; I'd only want my students to find it by invitation. So it could have a bare minimum homepage that doesn't even show what the site's for. I would do press releases to spark curiosity, but I'd intentionally keep it a mystery.
I'm a writer by trade that's very weak on the technical side of online marketing, so I was curious how hard something like this would be to implement. Any advice would be very appreciated.